. The Farm-poultry . not securesuccessful hatches. You cannot get the correct tem-perature unless you have a thermom-eter that tells the truth. •? A lying thermometer in an incu-bator will kill j-our chicks. { Still, some men never give a seriousthought to the trust-worthinessof the thermometers. 103 degrees is hatch-ing temperature. Youmay heat your incuba-tor up to 105 degreestor a short time, but 105degrees throughout thehatch means deadchicks. Neither can you golower than 100 degrees forany length of time and get livechicks. front porch, or in your incubator. See that tiny column of mercur
. The Farm-poultry . not securesuccessful hatches. You cannot get the correct tem-perature unless you have a thermom-eter that tells the truth. •? A lying thermometer in an incu-bator will kill j-our chicks. { Still, some men never give a seriousthought to the trust-worthinessof the thermometers. 103 degrees is hatch-ing temperature. Youmay heat your incuba-tor up to 105 degreestor a short time, but 105degrees throughout thehatch means deadchicks. Neither can you golower than 100 degrees forany length of time and get livechicks. front porch, or in your incubator. See that tiny column of mercury,not larger than a thread. Yet small as it looks to j-ou, yousee it several times larger than itactually is. The round glass tube is a verystrong magnifying glass, and magni-fies that column of mercury ten tofifteen times. If you broke the glass tube of thethermometer, you would find thehole about the size of a human hair. Yet this fine tube has to be madeexactly true, or the result is a ther-mometer that Now, suppose your thermom-eter is a lying thermometer. What if it says 103 degrees when it is really 105 or 106 degrees. You set the regulator so that it willkeep the egg-chamber at the wrong—t h e chicken-killing—temperature,and you watch that thermometerclosely for three weeks, never lettingthe temperature vary more than adegree. You think you have done your partof the work well, and you have, butthe thermometer has been lying toyou. Instead of the temperature be-ing 103 degrees it was 106 or 107 de-grees. You have actually roastedchickens alive. They Tell You Correctly WhatThe Temperature Is In YourIncubator, And You Will NotKill The Eggs With Too MuchHeat Or Too Little. your It is easy for a thermometer to at the thermometer on your This is not the only way that ther-mometers lie. The metal scale on which you readthe temperature may lie. There is only one way to make atruthful thermometer. Each tube must be tested sep-arately at several temperatures
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